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C. S. SHARP.

TANDENI HlTCI-I FOR DISK HARROWS.

APPLICATION FILED III/w21. |917.

IIIIMIOGG. `PIIII-IIIIIIII Nov. 18,1919.

4 SHEETS-SHEET I.

by im C. s. SHARP.

TANDEIVI HIICH FOR DISK HAHHOWS.

APPLICATION FILED MAY 21 1917.

. 322,06 6 Patented N 0V. 18, 1919.

4 SHEETS--SHEET 2.

C. S. SHARP.

TANDENI HITCH FOR DISK HARROWS.

APPLICATION FILED MAY 21. 1912.

l ,3122 ,066. Panted Nov. 18, 1919.

4 SHEETS-SHEET 4.

mwmr, YH/502773,

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man srnrns PATENT orricn- CHLRLES S. SHARP, 0F AUBURN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, 'tl INTERNAMONAL HARVESTER COMPANY, A. COBPURATION OF NEW JERSEY.

TANJDEM HITCH FOR DISK HARRDWS.

Specification of Letters Patent. Ptgntgd NUW, 1%, 1919i,

application tiled May 21, 191'?. Serial No. NJMB.

To all whom t may concern:

Be it known that l, CHARLES S. SHARP, a citizen of the United, States, residing at Auburn, in the county of Cayuga andl State of New York, have invented certain new and useful improvements in Tandem Hitches for llisk Harrows, of which the following is a full, clear, and exact specification.

lthis invention relates to tandem hitches for ground treating units., and more particularly to tandem bitches for disk harrows.

Two essential requisites for proper operation of double disk harrows are that there shall be flexibility so that the harrow may be easily turned under good and adverse conditions and that there shall be proper trail' ing of the rear unit so that ridges of ground made by the front harrow unit may be leveled by the trailing harrow unit. Most of the double disk harrows in use today have one or the other of these requisites, but they do not have both of these requisites, or do not have the same to a desired degree.

lt is, therefore, one object of my invention to connect two units in a manner such that there will beiiexibility between the various parts, and also proper trailing relationship to accomplish the desired re-A suits.

it further object of my invention is to provide a simple, durable and efficient harrow which is `adapted to meet all ofthe requirements for successful commercial operation.

rlhese and other objects are accomplished by providing a barrow having front and rear units and novel rearwardly, converging telescopically mounted connections between said units.

The invention is illustrated on the accompanying sheets of drawings, in which Figure 1 is a plan View of a double disk barrow embodying my invention;

Fig. 2 is a plan view of the same showing the relative positions which the front barrow unit and the rear harrow unit may assume in turning a. sharp corner;

lfig. 3 is a partial side elevation -with the disk gangs straightened up and showing one of the draft connections between the front and rear units;

Fig. 4 is a detail view showing one of the elongated .loop members secured to the rear harrow frame, and through which one of the' draft connections passes;

Fig. 5 is a fragmentary side elevation 'of the loop member and its support shown 1n F ig. f1;

Fig. 6 is a rear elevation of the rear unit of the tandem disk harrow;

F 1g. i's a fragmentary side elevation of the rear unit of the same tandem disk barrow;

Fig. 8 is a partial side elevation of a tandem disk harrow showing a modification of the connection between the front and rear units, said connection including ad- ]ustable means for controlling the proper division of the load;

lF 1g. 9 is a fragmentary plan elevation of one of the draft connections, showing the liti adjustable means in engagement with one corner of the rear harrow frame;

Fig. 10 is a view taken in the line 10-.10 of Fig. 9; and,` .llgx 11 'is a fragmentary detail sectional view of the adjustable means on the draft connections and taken in the plane of lin@ 11 11 of Fig. 10.

v The various novel features of my invenplane of tion will' be apparent from the following.

description and drawings and will be par# ticularly pointed out in the appended claims. y y

The invention is sho-wn in connection with a double disk barrow having a front unit 10 and a rear unit 11 which are tieXibly coni nected in a manner to be considered in detail hereinafter. The front unit includes a frame 12, to which are pivotally connected two disk gangs 13 'and 14 having frames 15 and 16, respectively. Connected to the inner ends of these disk gangs are links'l 'which are connected to operating levers 18,

whereby the singularity of the front disk gangs may be varied with respect to the line of draft.

rlhe rear unit includes a frame having a rear transverse frame member 19 and a front transverse 'frame member 20, the ends ofthe latter of which are bent 'to diverge rearwardly, forming side frame portions 21 and 22 which are secured to the rear transverse frame member 19. rThere are two disk gangs 23 and 24 connected to the rear frame on vertical pivots formed by depending portions 25 of the extreme ends of the rear iti till

ieu

Q is seen, therefore,

l line of dra'ft by levers eye members 26. Itis seen, therefore,

sited in all directions.

.the desired degree, l have frame member 19 passing down through suitable eye Inembers 26 on the gangs 23 and 24. 'The eye members have relatively large openingsto loosely receive the lower twisted ends 25 of the depending portions 25 of rear frame member 19, thereby providing in effect a universal joint whereby each rear gangmay swing bodily rearward and forward and in a vertical plane and in combinations of the same. The rear harrow gangs 23 and 24 are drawn forwardly through the pivotal connections at the eye members .26, which means that the 'forward cross frame bars 23 .and 24 of the rear harrow gangs normally engage the depending portions 25 of the frame member 19. However, when the harrow is backed, the rear gangs swing bodily rearwardly about the'pivotal connections at eye members 26, whereby frame bars 23 and 24 swing away fromdepending portions 25 of the rear frame member 19. To

vlimit the rearward swinging movement, a

bolt 19', provided with a limiting head and nut, loosely passes through openings in each of the frame depending portions 25 and central 'standard of each rear harrow gang. It that bodily swinging movement of the Arear harrow gangs is imited. The angularity of the rear disk gangs 23 and 24 may be varied with respect to the 27 which are connected to the inner portions of the disk gangs 23 and 24by links 28. -The inner ends of the rear disk gangs 23 and 24 are held substantially in a given vertical position by loop members 29 which inner ends of the disk vgangs and are looped around forwardly diverging brace bars 30 which connect the front and rear transverse frame members 19 and 2O.y The loop members 29 are provided with'aseries of open` ings 31 through which suitable bolts 32 may be passed to hold the rear disk gangs in lany vertical adjusted position. It is to be noted also that the inner ends of the rear gangs are raised and lowered about the pivots at that universal movement of the rear gangs is had about the connection at eye members 26 and that such movement is also positively lim- Brace bars 33 connect the side portions 21 and 22 of the rear frame with the-depending portions 25 thereo'f.

It has been found by experience that there must be a great deal ofieXibility between the front and rea-r units of a double disk harrow in order that the harrow may be properly turned without sluing the rear unit ailid cramping andtwisting the frame out of s a e.

'1go make double disk harrows flexible to connected the front and rearvunits in a novel manner by rearwardly converging draft bars or links 34 and 35, oneof the links 34 being vertiare connected to the when the, harrow is cally pivotally connected to the front gang frame 15 at the point 3G adjacent the vertical pivotal axis of the gang 13, and the other draft link 35 being vertically pivotally connected to the right front draft gang vframe 16 atthe point 37 adjacent its vertical pivot.` These bars or links 34 and 35 converge rearwardly and are on opposite sides of the longitudinal center or median lme of the harrow. The rear end of the draft link 34 is slidably or telescopically mounted with respect to the rear unit and passes through an elongated loop member 38 connected to the rear frame member 19. Similarly, the rear end of the other draft link member 35 is slidably or telescopically connected to the rear frame member and passes through an elongated loop member 39, also connected to the rear frame member 19. By referring to Fig. 3, it will be seen that each of the draft links includes two parts, the lower part having the 'front vertical pivotal portion which is pivoted to the front gang frame, said part extending rearwardly and about midway of its length having an upturned stop portion 40, the bar then'extending rearwardly parallel to the main lower portion of the bar and passing through the loop member secured to the rear transverse frame member 19. The other portion of each of the draft bars has its front endy 41 turned down and secured to the lower portion and extends parallel with and is connected to the lower portion by any suitable means, thereby forming guideways 42 through which the front portion of the rear harrow frame may slide, especially making a turn. Normally, as shown in Fig. 1, the stop portions 40 of the draft bars are in engagement with the front corner draft portions 43 formed by the bends in the transverse frame member 2O f or causing the rear unit to travel in aguided manner forwardly with the front unit when said front unit is moved forwardly. As is well known, the real test of flexibility occurs when the double disk harrow is making a turn. In many double disk harrows in making the turn the rcar unit is slued around, which is not only undesirable from the standpoint of work, but strains the frame of the machine very seriouslyand many times permanently twists the frame. With my draft connection a great degree of flexif bility is obtained. In making a short turn to the right, as shown in Fig. 2, the rear unit will be drawn entirely by the lefthand draft link 34while the other draft link will telescope or slide rearwardly through the loop member 39. 1t will thus be seen that each draft member is capable of acting independently of the other during the turning movements of the harrow. lt will be observed also that when making a short turn to the right, the stop member 40 on the link lill lill

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lil ll annabee away path,-the draft members immediately center themselves and divide the load, or.,

'in other Words, the stop members on the draft links 3d and 'immediately move into the draft corners a3 of the rear frame, and,

as a matter of VfactJ9 they are guided into such position by means of the angle of the portions 21 and 22 of the rear frame. lit will be noted also that `vvhen the harrovv is turned to the right to a considerable ern tent., as shown in Fig. 2, the stop member d0 on the right draft link 35 engages the rear frame member i9 adjacent the loop 39 to assist in turning the rear harrovv unit aecordingly. lin a lilre manner, when the harrow is turned to the left to a considerable erteilt, the other stop member l0 on the left draft linlr 3st will engage the rearframe member' 19 adjacent the other loop member 3d for a similar' purpose. lllhese stop members also limit a rearvvard'movernent of the front gangs to prevent contact between the front and rear dislrs, which otherwise might prove disastrous.

lt will be noted that the left hand draft member 3a forms aehord of an are of a cir cle struclr from the point 37 of pivotal conu nection between the front end of the other draft link '35 with the right front gang frame 16, and that the right draft link 35 forms a chord of an are of a circle strnclr from the point 36 of pivotal connection be tiveen the 'front end of the left draft linh with the left front gang' frame l5.

rlhis specific arrangement of the rearvvardlyl converging draft bars 34C and dii makes possible a draft connection between the front and rear barrow units which op crates with a great degree of eractncss and at the same time agreat degree of llenibility.' dit this point also attention is called to the fact that the loop members dit and 29, shown in detail in lFig. Lt, are elongated so that the rear ends of the draft linlrs 3i and 35 may have a considerable rising movement to increase the flexibility of the connection. rllhe necessity o'f the elongated loop members 3d and Ilil becomes apparent vvhen the barronT is given a short turn vvhile moving along a slope.

. .another desirable and,r as a matter effaet.,

necessaryrequirement for the successful operation of double dish harrovvs is that the rear dislts properly trail the front dialin in a mannerto level the ridges which are made by' the front dishs. r,this is accomplished by means of the draft connection which 'li have provided. in other Words, by means of this tit draft connection, the rear barrow unit is prevented fronisvvaying to the right or left as it is being drawn forwardly. lt trails and properly tracks the front disks in, taliing a curved path, as well as when taking a straight line movement. The two very de sirable features, therefore7 flexibility and proper trailing of the rear harroivfor the purpose stated, are accomplished by means of the draft connection which l have provided between the front and rear units. lit Will be noted, by referring to Fig. 3, that the rear yunit is prevented from tilting forvvardly for the reason that the front portion of the rear barrow frame located in the gnideivay formed by the ripper and lower 4portions of the draft links.

di modification of the invention is shown in Figs. d, 9, l0 and il2 wherein each of the draft bars 50 has a main portion 5l, and an t portion 55?; having its front end secured to theside of the former andl having its rear portion. connected to the main )ortion' 5l by a strap 53 having a rearwardly entending portion 5a With notches 55 formed in op posits sides thereof. Adjustably inminted on the strap ineriiber 53 is a lli-shaped member 56 havin at itsrear ende inwardly extending portions adapted to engage the various notches 55 in the strap 5t, whereby the ttshaped member may be held in any adjusted position when the bolt 5i', which passes through elongated slots in the ttshaped member and also through the' strap, is drawn up. The front or rounded portion of each lil-shaped member 56 engages its corresponding draft corne'r Lt3 of the reary harrovv` frame for draft purposesm lily means of this arrangement, it is apparent that if there is any slight irregularity in the manufacture of the rear barrow i frame., the same may be compensated. for by adjusting the members 5G on the straps 53 to equalize the draft during a straight for-` ward movement of the harrovv.

llt is evident that there may be varices modifications of my invention as herein par tenl arly shown and described, and it is my intention to cover all auch modifications `which do not involve a departure 'from the mounted draft members connecting said 1 imita the points of connection between said draft 'members with front and rear units relative to the median. line of the barrow bein different.

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lil() lin. a double intrler-nvu front and rear units, independently mounted. converging draft members connecting said units, and means allowing either member to telescope withv one of said units during turning movement of the liarrow.

4Q In a double barrow, front and rear units, independently mounted converging draft members-connecting said units, and means allowing either'member to telescope with the rear unit during turning movement of the harrow.

5. In a double harrow, frontand rear units, and converging. draft members between said vunits which are pivotally connected to one of said units, and means allowing either member to telescope with the other during turning movement of the harrow.

6. In a double harrow, front and rear units, converging draft members 'between said unit-s which are pivotally connected to the front unit, and means 'allowing either member to telescope with the rear unit during turning movement of the liarrow.

7. In a ground treating implement, front and rear units, independently acting rigid converging draft members connecting said units, means associated with said draft members for permitting both draft members to operate during the forward movement of the implement and one alone operating as a draft member during the turning movement of the implement.

8. ln a ground treating implement, front and rear units, independently acting rigid converging draft members connecting said units, means associated with said draft members for permitting both draft members to operate during the forward movement ofthe implement and that member alone opposite theyside toward which the implement is turned operating as a draft member during the turning movement of the implement.

9. A double harrow, comprising front and rear units, independently mounted converging draft members forming a connection between said units and having a relative sliding connection with respect to one of said units, and means whereby said members assume a given position when both units are moved in a straight line.

10. A double liarrow, comprising front and rear units, independently mounted and rearwardly converging draft members located upon opposite sides of the longitudinal center of the harrow coimect-ing said units and having sliding connect-ion with respect to one of said units.

11. In a ground treating implement, front and rear frames, ground treating tools cai'- ried by said frames, an elongated loop member secured to one of said frames, and a draft connectionbetween said front and rear frames and extending through and having'a longitudinal movement in said elongated loop member to form a fieXible connection between said front and rear frames.

12. In a ground treating implement, front and rear frames, ground treating tools carried by said frames, an elongated loop member secured to said reai frame, and a draft member connecting the front and rear frames and'being slidably mounted through and having a longitudinal movement in said elongated loop member to form a ieXible connection between said front and rear frames.

13. In a ground treating implement, front and rear frames, ground treating `tools carried by said f'ames, loop members secured to said rear frame, and rearwardly conveging draft members forming a connection between said front and rear frames and being slidably mounted through said loop meinbers.

14. In a ground treating implement, front and rear frames, ground treating tools carried by said frames, elongated loop members secured to said rear frame, and rearwardly converging draft members forming a flexible connection between said front and rear frames and being slidably mounted through said loop members.

15. In a ground treating implement, front and rear frames, ground treating tools carried thereby, loop members carried by one of said frames, draft members connecting said front and rear frames and longitudinally lslidable through and vertically movable in said loop members, and means to prevent tilting of the rear frame.

1G. In a ground treating implement, front and rear frames, ground treating tools cai'- 1 V e ried thereby, loop members carried by one of.

said frames, draft members connecting said front and rear frames and longitudinally slidable` through and vertically movable in said loop members, and means associated with the draft ineinhers to prevent tilting of the rear frame.

17. In combination, front and rear units including earth working tools, draft connections including converging draft members connecting the two units, said draft members hingedly mounted on one unit and having a forward and backward movement relative to said other unit, and means for limiting said forward and backward movement.

18. In combination, front and rear units including earth working tools, draft connections including converging draft menibers connecting the two units, said draft members hingedly mounted on the front unit and having a forward and backward movement relative to said rear unit, and means for limiting said forward and backward movement.

19. In a double barrow, a front unit and a rear unit, and converging flexible connecttions between the units equally spaced on iig;

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II Il Lafrance each side the central line, said connections being' adapted to slide at one end.

20. In a ground treating implement, front and i'ear frames, ground treating tools car! ried thereby, and a draft connection between said frames, said draft connection having straight spaced members for slidably receiving one of said frames.

2l. In a ground treatingimplement, front and rear frames, ground treating tools carried thereby, and a draft connection between said frames, said draft connection having.l

spacedmembers for slidably reoeivingthe rear frame.

22.. In a ground treating implement, front and rear frames, ground treating tools car- -ried thereby, and a draft connection between said frames, said draft connection having veitically spaced members, one ofv said members having a stop portion to limit relative movements 'between said frames.

23. In a double harrow, front and rear units, and rearwardly converging draft bars connecting said units, pivotally connected to one unit and slidably connected to the other unit, one of said draft bars being on a chord .of an are struck from the pivotal connec said draft bars.

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26, In a double barrow, front and rear units, draft bars connecting said units, and means on said draft bars for 'equalizing the draft effort exerted through said draft bars.

27. In a double harrow, front and rear frames, a gang of ground treating meinn bers having a universal connection with one of said frames, and means other than the universal connection for limiting movement` ofsaid gang relative to said frame'.

28. In a barrow, a frame having depend-` ing portions, gangs of ground treating members each including a single disk shaft pivotally connected to the depending por tions whereby the gangs may' tilt in different directions, and means other than said depending portions to restrict the tilting movement of said limits. Y

29. In combination, front and rear frames, earth working tools carried thereby, one of said frames including a member having con verging sides and a portion between said sides at right angles to the line of draft,

gangs within certain I draft elements connectiiigsaid frames and pulling forwardly and outwardly from the corners formed between the converging sides and said other portion.

30. In combination, front and rear frames, earth working tools carried thereby, one of said frames including a member having converging isides and a portion between said. sides at right angles to the line of draft, draft elements connecting said frames and pulling forwardly and outwardy from* the corners formed between the converging sides and said other portion and slidably connected thereto.

31. In combination, front and rear frames, earth working tools carried thereby, one of said frames including a member having converging sides and. a portion between said sides at right angles to the line of draft, draft elements connectingl said vframes and pulling-forwardlyand outwardly from the corners formed between4 the converging sides and said other portion, and slidably. connected thereto, said draft elements convergin toward the center line of draft.

32. n combination, front and rear frames, earth working tools carried thereby, inden pendently slidable draft elements connecting saidframes and converging toward the line of draft.

33. In combination, front and rear groups of earth working tools, and telescopically,

related frame elements connecting said front and rear groups including converging draft means pivotally mountedlatone end.

34.. In combination, front and rear groups of earth working tools, and telescopically related frame Aelements connecting said front and rear groups including converging draft means flexibly connected at one end.

35. In combination, front and rear groupslll' of earth .working tools, and telescopical related frame elements connecting said front and rear l:ji-oups including rearwardly converging draft means pivotally mounted at one'end. v

36. In an attachment for an implement, a group of ground treatin tools and frame members connected to sai group' including 'telescopically related elements, two of which forni converging draft members,

37.: In a double dislrharrow, front and rear harrow frames, dish gangs carried thereby, and converging coupling elements,

flexibly connected to one frame and slidabl connected to the other so as to permit longitiidinal movement and limited vertical movement in said last mentioned frame,

38, In a double dislr barrow, front and rear barrow frames, disk gangs carried, thereby, ,and 4converging coupling elemente pivotally connected to one-frame and slid ably connected to the other.

39. In a double dislr harrow, front and rear harrow. frames, dish gangs carried Itlfl Imi iis

ist

I thereby, and converging rigid coupling elements pivotally connected to one frame and slidably connected to the other.y

40. In a double disk barrow, front and rear harrow frames, harrow units carried 'thereby,.coupling elements. pivotally conf/nected to the front frame at points equally distant on each side of the line of draft,

the rear frame including members forming corners at less distance from the vline of draft than the forward pivotal points, the coupling elements slidably engaging the rear frame at said corners.

42. In a double disk barrow, front and vrear liarrow frames, hai-row units carried the rear frame including members formlng.

corners at less distance from the line of draft than the forward pivotal points, the coupling elements slidably engaging the rear frame at said corners, and means for preventing tilting of the rear frame.

43. In a, double disk barrow, front and rear barrowA frames, barrow units carried thereby, coupling elements pivotally connected to the front frame at points equally distant on each side of the line of draft, the rear frame including members forming corners at less distance from the line of draft than the forward pivotal points, the coupling elements slidably engaging the rear frame at said corners, and means connected with the coupling elements for preventing tilting of the rear frame.

In testimony whereof I afiix my signature.

CHARLES S. SHARP. 

